Android开发之onClick事件的三种写法

Android开发之onClick事件的三种写法

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[java]
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package a.a;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

import android.widget.EditText;

public class AActivityextends Activity {

/** Called when the activity is first created. */

EditText Ev1;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

Ev1 = (EditText)findViewById(R.id.editText1);

//第一种方式

Button Btn1 = (Button)findViewById(R.id.button1);//获取按钮资源

Btn1.setOnClickListener(new Button.OnClickListener(){//创建监听

public void onClick(View v) {
String strTmp = "点击Button01";
Ev1.setText(strTmp);
}

});

//第二种方式

Button Btn2 = (Button) findViewById(R.id.button2);//获取按钮资源

Btn2.setOnClickListener(listener);//设置监听

}

Button.OnClickListener listener =
new Button.OnClickListener(){//创建监听对象

public void onClick(View v){
String strTmp="点击Button02";
Ev1.setText(strTmp);
}

};

//第三种方式(Android1.6版本及以后的版本中提供了)
public void Btn3OnClick(View view){
String strTmp="点击Button03";

Ev1.setText(strTmp);

}
}

package a.a;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class AActivity extends Activity {
/** Called when the activity is first created. */

EditText Ev1;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

Ev1 = (EditText)findViewById(R.id.editText1);

//第一种方式
Button Btn1 = (Button)findViewById(R.id.button1);//获取按钮资源
Btn1.setOnClickListener(new Button.OnClickListener(){//创建监听
public void onClick(View v) {
String strTmp = "点击Button01";
Ev1.setText(strTmp);
}

});

//第二种方式
Button Btn2 = (Button) findViewById(R.id.button2);//获取按钮资源
Btn2.setOnClickListener(listener);//设置监听

}

Button.OnClickListener listener = new Button.OnClickListener(){//创建监听对象
public void onClick(View v){
String strTmp="点击Button02";
Ev1.setText(strTmp);
}

};

//第三种方式(Android1.6版本及以后的版本中提供了)
public void Btn3OnClick(View view){
String strTmp="点击Button03";
Ev1.setText(strTmp);

}
}

[html]
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<?xmlversion="1.0"encoding="utf-8"?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">

<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"/>

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button1"/>

<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button2"/>

<Button

android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button3"
android:onClick="Btn3OnClick"/>

<EditText
android:id="@+id/editText1"
android:layout_width="match_parent"
android:layout_height="wrap_content">

<requestFocus/>

</EditText>

</LinearLayout>